Stability checkpoint stable-v1.0.26 (UI) — Phase 4.2 wave continued: 18 KeyboardService tests covering all global shortcuts (Ctrl+K search, ?/Esc, G then X navigation 5x, D/R single keys, focus guards) + 1 ESLint regression fix (no-empty-function caught by Phase C flip on mockImplementation(() => {}) — 2nd flip catch this session). Cumulative UI Phase 4.2: 83 new UI tests across 6 specs. Post-merge main pipeline #386 SUCCESS.